Design and fracture of layered Al2O3/TZ3Y composites produced by electrophoretic deposition

被引:35
作者
Hatton, B [1 ]
Nicholson, PS [1 ]
机构
[1] McMaster Univ, Dept Mat Sci & Engn, Ceram Engn Res Grp, Hamilton, ON, Canada
关键词
D O I
10.1111/j.1151-2916.2001.tb00700.x
中图分类号
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Alumina/yttria-stablized tetragonal zirconia (Al2O3/TZ3Y) multilayer composites with strong interfaces and containing residual stresses were produced by electrophoretic deposition. As-synthesized and Vickers-indented samples with different layering designs have been tested in bending (up to 1300 degreesC) to experimentally define conditions for crack deflection and flaw tolerance. The compressive residual stress in the Al2O3 layers (sigma (r)) is a function of layer thickness (t). It was found that the parameter oft is an effective indicator of the fracture behavior, as predicted by strain energy release calculations. With decreasing sigma (2)(r)t, the fracture followed a sequence from spontaneous delamination, multistage fracture with extensive crack deflection, to catastrophic failure with, and finally without, deflection steps. Decrease of sigma (r) with increasing test temperature causes changes in fracture behavior which correspond to the room-temperature transitions of o(r)(2)t.
引用
收藏
页码:571 / 576
页数:6
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